Amazon Linux 2 : perl-HTML-Parser, --advisory ALAS2-2026-3357 (ALAS-2026-3357)

high Nessus Plugin ID 322042

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of perl-HTML-Parser installed on the remote host is prior to 3.71-4. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3357 advisory.

HTML::Entities versions before 3.84 for Perl read freed heap memory in _decode_entities.

The XS routine backing HTML::Entities::_decode_entities cached a pointer (repl) into the entity-value SV returned by hv_fetch on the entity2char hash. When the input SV was identical to a value SV in that hash, and that value contained its own key as an entity reference, a later call to grow_gap() reallocated the SV's PV buffer and freed the backing allocation that repl still pointed into. The subsequent copy loop read repl_len bytes from the freed allocation.

The read may disclose adjacent heap contents into the destination SV. (CVE-2026-8829)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update perl-HTML-Parser' or or 'yum update --advisory ALAS2-2026-3357' to update your system.

Plugin Details

Severity: High

ID: 322042

File Name: al2_ALAS-2026-3357.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 6/22/2026

Updated: 6/22/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

CVSS Score Source: CVE-2026-8829

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:perl-html-parser-debuginfo, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:perl-html-parser

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 6/4/2026

Reference Information

CVE: CVE-2026-8829

Detections

Analytics